Users booting up their newly released iPhone 5s or iPhone 5c on Friday will be prompted to install a minor operating system update, intended to squash a few minor bugs Apple discovered with its latest handsets.

Apple on Thursday started putting up window dressing at one of its Australian retail outlets ahead of the iPhone launch on Friday, with the colorful 5c taking space to one side of the store's door, while the other is dedicated to the high-end 5s.

Just after midnight local time, Apple opened sales of their new flagship iPhone 5s and 5c to customers in in the Far East and Down Under, and orders were immediately met with delays of a week or more, pushing deliveries into the next month.

While many market watchers are concerned that Apple has not announced preorder numbers for the iPhone 5c and may face supply constraints with the iPhone 5s, one analyst believes launch weekend sales will blow past last year's record setting iPhone 5 performance.

Although Apple has yet to announce preorder numbers for its iPhone 5c, one of two new iPhones being launched on Friday, one analyst believes the company will likely hit 5 to 6 million combined unit sales this weekend.

With Apple's iPhone 5s and 5c scheduled to hit the market on Friday, reviews for the two devices are being published to the Web by all major news outlets and the initial impressions are largely positive.

Prior to the official announcement of the iPhone 5c, observers expected that Apple would offer its new smartphone at a competitively low price to take away market share from cheap devices running Android. But the company instead opted to stand its ground on pricing  a controversial strategy that caught the market by surprise.

Sprint on Monday announced a promotion set to kick off on Sept. 20 that will give a $100 credit to new customers porting their phone number from another carrier, applicable to the iPhone 5s and 5c which are slated to go on sale that same day.